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Jansen experienced a recurrence of his irregular heartbeat on Aug. 9 before the start of a four-game series in Colorado, with Jansen calling 911 when an accelerated heartbeat would not subside. His heart had to be shocked back into rhythm at a Denver hospital. Increased elevation can exacerbate an irregular heartbeat.

Jansen went on the 10-day disabled list with an irregular heartbeat and began taking blood-thinning medication. He struggled upon his return, giving up runs in four consecutive outings while taking a loss and blowing two save opportunities and eventually was given the OK to get off the medication.

Jansen had 38 saves and a 3.01 ERA in 69 relief appearances this season. In nine postseason appearances, he had a 1.69 ERA, three saves and 13 strikeouts.